Free response · Unit 7 Beta

Solution curves on a slope field with an equilibrium line

Differential equation and slope field · Part B: no calculator · 9 points

The question

Name: ______________________   Date: ____________   Solution curves on a slope field with an equilibrium line (9 points)

Graph

The slope field of dydx=(y−2)cos⁡x\frac{dy}{dx} = (y - 2)\cos x

−3−2−112301234xy(0, 3)(0, 1)
  1. (a) On the slope field, sketch the solution curve through (0,3)(0, 3) and the solution curve through (0,1)(0, 1). [2 points]

  2. (b) Write the equation of the constant solution to the differential equation. Explain why the solution curve through (0,1)(0, 1) stays below it. [2 points]

  3. (c) Let y=f(x)y = f(x) be the solution through (0,3)(0, 3). Find the value of xx in (0,π)(0, \pi) at which ff has a relative maximum. Justify your answer. [2 points]

  4. (d) Find y=f(x)y = f(x), the particular solution with f(0)=3f(0) = 3. [3 points]